Humanisator works as some kind of anti-quantizer, bringing more human feel into sequenced notes. You can define how much and in what range Humanisator should alter the timing, velocity, pitch and modulation of the MIDI stream, allowing very natural sounding and interesting phrases to be created easily!

I think it would have been better with a "chance" selector, like the random effect from Ableton. You can only select the min/max value. For Ableton, it's a little complex to use. You have to put it on a separate track, and on the track that contains your instrument that you want to Humanize, you select the midi source from the Humanisator track, and select from the plugin Humanisator.